SkyLieAngelNah, one can never take anything for granted that it is 100% legit. Hatched shiny are the easiest to hack and made to look legal too.

As for events, the foolproof method is to compare the hex values of those you received from others with the ones you obtained yourself, provided you are comparing the same events. Other than that, you can only rely on the current Pokecheck.org.

Level 48(Met at level 10)Fateful encounter.Serious Nature.OT:MYSTRY(The name appears to be bolded in red)ID:06930Ability:SynchronizeCaught in a pokeball.HP:169ATK:118DEF:105SPA:119SPD:107Speed:110.Not concerned about the moves since mew can learn anything.

I'm more concerned about the Mew's Legality moreover than anything else.

[5th] I recently got a Deoxys that is level 100, Japanese. I ttried trading it on the GTS, for a different Deoxys, and I got one, but it was level 100! So I did it again, and yet another Japanese level 100! Can you guys telll me if it's legit? Also, every deoxys that I got was from Kanto, and I looked up its moves and compared them to the ones it has, and they seem legit.